Albeet bonzon



(No Model.)

A BONZON Chronograph Watch,

Patented Feb.. 1,1881.

INVBNTOR 6:/ 'WM WITNESSBS ATTORNEYS.

UNITED STATES PATENT OFFICE..

ALBERT BONZON, OF SANTIAGO, CUBA, ASSIGNOR TO HIMSELF AND PROSPER NORDMANN, OF NEV YORK, N. Y.

CHRONOGRAPH-WATCH.

SPECIFICATION forming part of Letters Patent No. 237,159, dated February 1, 1881.

Application filed April 30, 1880. (N o model.)

To all whom it may concern:

Be it known that I, ALBERT BONZON, of Santiago, Cuba, have invented a new and Improved Ohronograph-Watch, of which the following is a specification.

The object of my invention is to provide a new and improved chronograph-watch which is simple in construction and accurate and reliable in operation.

The invention consists in a wheel rigidly attached to the second-hand arbor and roughened on its upper surface, and in a heart-cam with a roughened lower surface, which cam is loosely mounted on the second-hand arbor, and is provided with a sleeve carrying the secondhand and acted upon by a spring, whereby it can be raised or lowered so as to come in and out of contact with the roughened wheel.

The invention further consists in an adjustment-screw on the spring acting upon the cam, which screw permits of regulating the distance that the end stud of this spring is removed from the heart-cam.

It further consists in an adjustable bearing for the second-hand arbor.

In the accompanying drawings, Figure l is a plan view of my improved chronograph attachment. Fig. 2 is a longitudinal sectional elevation of the same.

Similar letters of reference indicate corresponding parts.

A wheel, disk, or plate, A, roughened on its upper surface in any suitable manner, is rigidly mounted on the second-hand arbor B, directly above the top plate, C, of the works. A heart-cam, D, roughened on the lower surface in the same manner as the upper surface of the wheel A, is loosely mounted on the arbor B, and is provided with a sleeve, E, surrounding the arbor B and carrying the second-hand F. The sleeve E is providedwith an annular -flange, G, directly above the cam D, and forming an annular groove, H, with the said cam.

A spring, J, is attached at one end to the top plate, G, and is provided with a setscrew, I, near its center, resting upon the vertical teeth of a wheel, K, also provided with two sets of horizontal teeth. The forward loose end of said spring passes into or through the 5o annular groove H. As the elasticity of the spring J must be in the part from the screw I to the fixed end, this part is made very dat; and as the part from the set-screw I to the loose end must be very stiff, this part is made of the same height as the groove H, and is as thin as possible, so as to produce very little friction with the top or bottom of the groove.

A spring, L, with a triangular or like stud, N, at the end, is attached to the top plate, C, in such a manner that its end stud will press against the heart-cam D. The said spring is provided with a set-screw, M, near its center, the front end of which screw rests against the peripheral teeth of the wheel K. The lower end of the second-hand arbor istapered, passes through a jewel, Q, and rests on the jeweled end R of a set-screw, S, held iu a bridge, T, or like device, attached to the under side of the bottom plate, V, of the works.

I do not limit myself to the exact construction of the springs described above, but may use any other suitable modification of the saine, or may replace them by pivoted arms or levers acted upon by springs.

The wheel K is acted upon by a pawl actuated by means of a button in same manner as in other chronograph or horsetiming watches.

The operation is as follows: If the roughened surface of the heart-cam is in contact with the roughened surface of the wheel A, then the heart-cam and second-hand will rotate with the said wheel, which is rigidly attached to the second-hand arbor. The surfaces are to be roughened in any desired manner, the object aimed at being to secure sufficient friction to cause the heartcam to rotate with the wheel A when they are in contact. As shown, the heart-cani and the wheel are not in contact and the second-hand does not move. If the wheel K is now rotated, as indicated by its arrow, the screw M will slide off of the peripheral tooth, thereby throwing the stud N against the heart-cam, which throws the second-hand back to 12. If the wheel K is again rotated, the screw I will slide 0E of the vertical tooth upon which it rests, and consequently the loose end of the spring J will be lowered and will bring the heart-cam D and the wheel A in contact, whereby the heartcam rotates with the wheel. If the movement IOO of the second-handis to be stopped, the wheel K is again rotated, causing the screw I to ascend the next vertical tooth, whereby the loose end of the spring J is raised and the cam and wheel A are separated, causing the secondhand to stop its movements. At the next rotation of the wheel K the spring L throws the second-hand back to-12, and the above movements are repeated. By means of the screw I the distance that the cam D is raised can be regulated in the most simple manner, and if the bearing-point of the screw becomes worn off it can easily be renewed without requiring a new spring, as is the case in the chronographs in use at present. Likewise the spring L can easily be adjusted by the screw M, and a new spring is not required when the bearing becomes worn od'. The position of the wheel A above the top plate, B, can be regulated by means of the screw S, upon the jeweled head It of which the arbor B, carrying said wheel A, rests.

I am aware that a wheel with radial teeth on the upper surface has been used in combination with a pin on a loose wheel, or with a clutch consisting of three pins 5 but this I do not claim.

Having thus described my invention, I claim as new and desire to secure by Letters Patentl. A chronograph attachment for watches made substantially as herein shown and-described, and consisting of a disk or Wheel with a roughened surface attached to the secondhand arbor, and of a heart-cam with a roughened surface loosely mounted on the secondhand arbor and carrying the second-hand, whereby the second-hand is carried around if the roughened surfaces of the heart-cam and disk are in contact, as set forth.

2. In achronograph attachmentfor watches, the combination, with the second-hand arbor, of the fixed wheel or disk A, the heart-cam D, and spring J, substantially as herein shown and described, and for the purpose set forth.

3. In a chronograph attachment for watches, the heart-cam spring L, constructed substantially as herein shown and described, with an adjusting-screw, M, as set forth.

The above specification of my invention signed by me this 19th day of April, 1880.

ALBERT BONZON.

Witnesses:

OscAR F. GUNZ, C. SnDGwrcK. 

